| occurrence of la crosse (california serogroup) encephalitis viral infections in illinois. | la crosse (lac) virus (california encephalitis serogroup) was identified as the etiologic agent of disease in 61 cases of california encephalitis (ce) that occurred in illinois between 1976 and 1980. this group represented 54% of all 114 laboratory-diagnosed cases of ce between 1966 and 1980. key epidemiologic observations included: 88% of the 61 cases had onset in july, august, or september; the 5- to 9-year-old age group represented 48% of the cases; the male:female sex ratio was 2:1; 97% of t ... | 1983 | 6881433 |
| genotypic varieties of la crosse virus isolated from different geographic regions of the continental united states and evidence for a naturally occurring intertypic recombinant la crosse virus. | the tripartite ribonucleic acid (rna) genomes of 23 alternate isolates of la crosse virus have been analyzed by the procedure of oligonucleotide fingerprinting. by comparison with the fingerprints of the three viral rna species (large, medium and small) of prototype la crosse virus, the viruses have been categorized in terms of the degree of their rna sequence relatedness. the a type la crosse viruses, which have been recovered from wisconsin, minnesota, indiana and ohio, have viral rna sequence ... | 1981 | 7246519 |
| persistence of la crosse virus (california encephalitis serogroup) in north-central illinois. | la crosse (lac) virus was first isolated in illinois from a pool of 50 female aedes triseriatus mosquitoes collected in july 1976, in peoria heights. from 1978 through 1981, 27 strains (11 from males and 16 from females) of lac virus were recovered from 888 pools containing 22,021 adult a. triseriatus mosquitoes from the same study area. these mosquitoes had developed from larvae and pupae collected from 50 individually identified treeholes. of the 14 trees that yielded lac virus-positive mosqui ... | 1983 | 6824122 |